改进了简单工厂模式的实现策略，克服了原来简单工厂模式的局限性，同时弥补了工厂方法模式的不足。
The policy of Simple Factory is reformed, and applied to produce command objects, which eliminates the limitations of past Simple Factory and makes up the defect of Factory Method.
最简单的方法就是在工厂模式中把代理类的建立封装起来。
The simplest approach is to encapsulate the creation of the proxy class within the Factory pattern.
最简单的方法就是在工厂模式中把代理类的建立封装起来。
The simplest approach is to encapsulate the creation of the proxy class within the Factory pattern.
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